Micrometer measuring and scribing tool



1951 J. J. TWARDOWSKI MICROMETER MEASURING AND SCRIBING TOOL 3Shets-Sheet 1 Filed May 2'7, 1949 INVENTOR.

JoimJ. TWARDOWjKI ATTORNEY-'1 Dec. 11, 1951 J, TWARDQWSKI 2,578,615

MICROMETER MEASURING AND SCRIBING TOOL Filed May 2'7, 1949 3Sheets-Sheet 2 l5 Emil/g INVENTOR.

. JOHN J, Twnknawkl BY, I

HI} ATTORN EYiI.

Dec. 11, 195] J. J. TWARDOWSKl MICROMETEJR MEASURING AND SCRIBING TOOL 3sheeis-sheet 3 Filed May 2'7, 1949 INVENTOR. Jomv J TWA RDOkl}/(l H7ATTORNEYfi Patented Dec. 11, 1951 UNITED STATS PATENT OFFICE MICROMETER.MEASURING AND SCRIBING TGOL Claims.

This invention relates in general to instruments or tools for theprecision measurement of dia1neters and/or scribing of surfaces, and hasas its principal object, the provision of certain desired improvementsover the expanding tool described in my Patent No. 2,383,028, datedAugust 21, 19 15.

A more particular object of the invention is the provision of amicrometer divider or scribing instrument of an improved design andconstruction, especially adapted to assure and maintain accuracy ofmeasurement, and compensate for wear while permitting a reduction incost of manufacture.

Another object is to provide a precision measuring instrument for themicrometer scribing of surfaces, and having novel detachable andreplaceable means for purposes of adjus nent, corn venient replacement,if required, and of a design facilitating its production on a quantitybasis.

A further object is the provision of a micrometer measuring instrument,wherein the adjustable and threaded components and the scribing elementsmay be quickly and conveniently compehsated for pcssil. e wear, orreplaced, if desired.

Other objects and advantages of the present design and construction willappear as the description proceeds, and will be more fuily understoodwhen taken in connection with the accompanying drawings, wherein:

Figure 1 is a plan View of a micrometer measur-, ing or scribing toolembodying the invention;

Fig. 2 is a side elevational view thereof;

Fig. 3 is a detail, perspective view showing the central operating bardetached from the assembly shown in Fig. 1;

Fig. 4 is an enlarged, fragmentary, detail view, partly in section, andshowing elements associated with the Vernier dial;

Fig. 5 is an enlarged, fragmentary, detail view, partly inv section, andshowing one of the novel detachable, threaded sleeve members andassociated parts which cooperate to move the scriber holders Whileproviding means compensating for wear or lost motion;

Fig. 6 is an enlarged, perspective view of one of the threaded sleeves,shown in section in Fig. 5, and from which the insertable elements havebeen removed;

Fig. 7 is an elevational view, partly in section, of the block to whichthe Vernier dial scale isoperatively attached; and

Fig. 8 is a view similar to Fig. 7, but showing one of the adjusting andcompensating blocks which carry a scriber element.

Referring now to the drawings in particular,

wherein similar characters of reference indicate corre onding parts inthe several views of the prefe form of the invention, the numeral Hdesignates the manually operable, central adjusting bar, which issubstantially cf rectilinear configuration in cross section (Fig. 7) andhaving two opposite sides provided with a series of bevsled recesses, asat 52, as best shown in Figs. 1 a1 3. As hereinafter described, theserecesses provide means for the convenient positioning and sewing of theremovable and relatively adjustable threaded sleeves i3, [4, which areoppositely threaded and which form one of the features of the inventionand which coast with the adjusting bar ii to move the carrier blockshaving the scribing members.

A bearing surface is formed at approximately the center of the bar H toaccommodate a bushing or hearing i6 (Fig. 4), the bearing in turn beingpress fitted in a pocket 57 formed in the body portion l8 of a sectionalblock E9. The block 59, as best shown in Fig. 7, includes the main bodyportion E8 to each end of which a clamping portion or plate 23', 2! isdetachably secured, as by the screws 22. semicircular grooves, in theopposed edges of the said body portion and plates, provide holes, as at23, which clampingly receive reduced portions 24a and 25a formed onlongitudinally extending guide bars 25., 25. The reduced portions 24aand 25a serve to maintain the block it in a fixed central position withrespect to the guide bars. An adjusting nut mounted on a centralthreaded porticn 27 of the adjusting bar 5 i, is normally in abutmentwith a washer 28 directly engaged against the outer face of the saidbearing and the adjacent inner periphery of the pocket, and having anopening adapted to accommodate an annular shoulder 28a on said nut. Thisshoulder or extension 28a affords the adjusting nut a further degree ofrotation, when desired.

The adjusting bar H, which in cross section, as seen in Fig. 7, has arectilinear configuration, is knurled as at 223, the latter receivingaVernier or micrometer dial 39 which is secured thereon by a set screw3|. By inspection of Fig. l, itwill be seen that the guide bar 2 isprovided with a calibrated scale which provides a rough measuringindication of a surface or diameter to be scribed or measured, theVernier dial then affording a micrometer indication of the extent of thedimension.

The removable relatively adjustable sleeves l3, it, mentioned above, areindividually shaped to provide beveled, cut out portions, as at 33,adapted to receive correspondingly beveled plugs or inserts 34, whichare fastened thereto by .set screws, as at 35 threaded into holes 38formed in the beveled portions of the adjusting bar II. By the meanslast recited, it will be seen that these adjusting sleeves may bequickly secured to the adjusting bar I after being located at thepositions suitable for measuring surfaces of diversified extent. Eachadjusting sleeve [3, is has an extended socket portion, as at 36c, andhas its threaded portion received in a correspondingly threaded openingprovided in each of the similar scriber-carrying blocks 31, whosestructure is best shown in Fig. 8, and which includes holes 38, 39slidably accommodating the longitudinally extending guide bars 24, 25,respectively, mentioned above. By further inspection of Fig. 8, and asanother feature of this invention, each carrier block 3'! is formed witha slot 40 extending from its outer edge and communicating with a centralopening M, which accommodates the adjacent sleeve l3 or i l. Eachopening 4| is threaded with the threads assuming a directioncorresponding to that of the threads on the sleeve received therein.Thus, the openings II are oppositely threaded. The periphery of theopening 4| is widened or recessed at one point adjacent to an upperportion of the block, as at 42, with a view to providing resiliency whenmaking adjustments or taking up lost motion of each block relative toits cooperating adjusting sleeve. lhe means for adjusting or taking uplost motion referred to, include a screw 43 which passes through a bolthole extending through the block and through the opposed surfacesadjoining the slot 40, the end of the said screw being engaged by a nut44 secured in a pocket Mi in the lower edge of the block. When the screw43 is turned, it

will be understood, the portions of the block on either side of the slot45 may be slightly separated or brought together, so that the adjacentadjusting sleeve within the opening 4! may be operatively and clampinglyengaged. It will now be apparent that if lost motion, relatively to theblock and the adjacent adjusting sleeve, should occur over a long periodof use, this may be taken up by the screw s3 and nut 54. Or, ifmanipulation of the adjusting bar H is too stiff or diflicut, the screw.3 will be turned to secure the desired tension. The blocks 3'! haveprojecting lugs or sockets 45, each formed with a tapered pocket, as at46, to receive a corresponding inner taper 41 on a scriber member 48,detachably insertable therein. By the means illustrated, the scribers 48may be quickly withdrawn and repointed, and then instantly replaced, thecoacting beveled or tapering surfaces affording a secure retention ofthe scriber, while permitting its ready release, when desired.

The function and general mode of operation of the device has been inlarge measure indicated above, but may be summarized as follows:

Assuming that it is desired to sc'ribe or measure a surface, theadjusting nut 26 will be turned sufficiently to permit the bar H to berotated, thereby conveying the carrier blocks 31 with their scribers tothe points or lines desired. The scale 32 will then denote approximatelythe distance between the scriber points while the vernier scale willshow the number of thousandths of an inch to be added to the rough scalemeasurement.

With reference to the adjusting sleeve members- I3, id, these may be putunder the proper tension by the semi-split carrier blocks 3! to maintaina snug fit while permitting reasonable ease of manipulation of theadjusting bar l I.

The adjustable sleeve members [3, M, in addition to their normalfunction of conveying the scriber-carryin blocks 31 towards and awayfrom each other, provide, as mentioned above and in combination withtheir adjacent split carrier blocks, a convenient method and means ofeliminating lost motion caused by wear, and providing the amount ofmanipulating friction the individual user of the tool desires.

While certain preferred embodiments of the invention are hereinbeforeset forth, it is to be clearly understood that the invention is not tobe limited to the exact construction illustrated and described becausevarious modifications of the details may be provided in putting theinvention into practice within the purview of the appended claims.

What is claimed is:

1. In a measuring and scribing tool of the kind described, incombination, scribing means, parallel supporting means for said scribingmeans, guiding means to maintain the supporting means in spaced,operable relation, a scale on said guiding means, a longitudinallyextending member protruded through the supporting means, other meansconnected to the member and supporting means and rotatable with themember to move said supporting means, said other means beinglongitudinally adjustable on the said member, and a vernier dial securedto the member and coactable with the scale to indicate measuring values.

2. In a device of the kind described, a pair of scribing means, asupport for each of said means, said supports being arranged in parallelrelation, a pair of members arranged in spaced relation and slidablyreceiving said supports, a rotatably threaded bar arranged between saidpair of members and passing through threaded opening in said supports, ascale arranged on one of the pair of members, a vernier dial mounted onthe bar and coactable with the scale to indicate measuring values, meanssecured to and longitudinally adjustable on the bar and coactable witheach of said supports; whereby when said bar is turned, said supportsand scribing means will be moved and said dial and scale will denote thedistance between the scribing means, and means on each of saidsupportsfor compensating for lost motion between said supports and said member.

3. In a measuring and scribing tool of the kind described, a pair ofguide bars arranged in spaced parallel relation with respect to eachother, a pair of blocks slidably arranged on said guide bars, each ofsaid block's being provided with an opening therein, a scriber securedto each of said blocks, a sleeve engaged in each of said openings, meanson each block to expand and contract the opening therein, alongitudinally extending member whereon said sleeves are longitudinallyadjustable, a bearing block turnably receiving said member, a scale onone of the guide bars,

and a vernier dial fastened to the member.

4. In a measuring and scribing tool of the kind described, a pair ofguide bars arranged in spaced parallel relation, a pair of blocksslidably arranged in spaced parallel relation on said guide bars, eachof said blocks being provided with a threaded expansible openingtherein, scribing means secured to each of said blocks, a socketarranged on each of said blocks and effective to detachably retain oneof the scribing means, a

sleeve threadedly engageable in the expansible opening and having cutout portions, elements insertable in said out out portions, a barextending through the expansible openings, said elements beingdetachably secured to the lastnamed bar, and a scale arranged on one ofthe guide bars and coactable with a vernier on said last-named bar.

5. In a measuring and scribing tool of the kind described, incombination, a pair of carrier blocks arranged in spaced parallelrelation, each of said carrier blocks being provided with an expansiblethreaded opening therein, scribing means detachably mounted on each ofsaid carrier blocks, a pair of guide bars slidably accommodating thecarrier blocks, means to expand and contract said openings, said meansincluding threaded means secured to the block and a slot extending froman outer edge of the block and communicating with the opening, said slotbeing contractable by said threaded means, a sleeve threadedly engagedin each of said expansible openings, a bar extended through said blocksand having cut out portions, said sleeves having cut out portionsregistering with the cut out portions of the bar, insertable elementspositioned in the registering cut out portions in the last named bar andsaid sleeve, means to detachably secure the blocks and consequently thesleeves in fixed relation to said last named bar, a sectional blocksecured to said guide bars and between said carrier blocks, a bearingmember in the sectional block and rotatably supporting said bar, andscale means on one of the guide bars and the bar having cut outportions.

. JOHN J. TWARDOWSKI.

REFERENCES CITED The following references are of record in the file ofthis patent:

J UNITED STATES PATENTS

